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Introduction

---

• Overview of the Twin Disc MG516 and MG5161
• Why regular maintenance matters for marine transmissions
• Who this guide is for: fleet operators, commercial captains, independent marine mechanics
• Disclaimer: Refer to the OEM service manual for exact torque specifications and detailed technical procedures
  

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Technical Overview of the MG516 Marine Gear

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Key Features of the MG516

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• Heavy-duty marine transmission designed for commercial use
• Smooth hydraulic shifting and durable reverse gear system
  

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General Specifications

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• Model: MG-516 and MG-5161
• Gear ratios
• Oil capacity and type
• Dry weight and dimensions
• Recommended operating pressures
  

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Safety Precautions and Required Tools For The Twin Disc MG516 Marine Gear

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Personal Protective Equipment (PPE)

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• Essential gear for safe maintenance work
  

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Lockout/Tagout Procedures

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• Ensuring system is de-energized before beginning service
  

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Recommended Tools

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• List of essential mechanical and diagnostic tools
  

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Routine Maintenance Tasks For The Twin Disc MG516 Marine Gear

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Oil Change Intervals

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• Frequency and best practices
  

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Filter Element Replacement

• Locations and procedures
  

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Visual Inspection Checklist

• Early signs of wear or failure
  

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Draining and Refilling the Transmission Oil

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Draining Procedures

• How to safely remove used oil
  

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Refilling Procedures

• Steps to properly refill and confirm correct levels
  

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Hydraulic System Servicing

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Checking Operating Pressure

• How to check and what PSI range is acceptable
  

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Replacing Hydraulic Seals

• Where to inspect and how to replace common failure points
  

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Clutch and Gear Inspection For Twin Disc MG516 Marine Gear

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Clutch Pack Inspection

• Wear indicators and disassembly notes
  

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Gear Train and Tooth Wear

• Backlash measurement and gear condition inspection
  

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Output Shaft and Rear Housing Maintenance For Twin Disc MG516 Marine Gear

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Bearing and Seal Inspection

• What to look for and when to replace
  

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Shaft Alignment and Runout

• How to check for misalignment and correct it
  

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Cooler and Oil Circulation System For Twin Disc MG516 Marine Gear

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Heat Exchanger Inspection

• Inspection and flushing procedures
  

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Oil Flow Testing

• How to confirm proper cooling and flow rate
  

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Control Valve Maintenance For Twin Disc MG516 Marine Gear

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Solenoid and Valve Cleaning

• Steps for removing and cleaning the valve assembly
  

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Testing Shifting Operation

• Manual and electronic troubleshooting procedures
  

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Reassembly Tips and Best Practices For Twin Disc MG516 Marine Gear

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Torque Specifications

• Use of torque wrenches and common values
  

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Use of Gasket Sealant and RTV

• Best practices for leak prevention
  

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Pre-Startup Checks

• Final inspection and pre-run checklist
  

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Recommended Spare Parts and Kits For Twin Disc MG516 Marine Gear

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Rebuild Kits

• What’s included and where to get them
  

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Commonly Replaced Parts

• Filters, gaskets, clutches, and seals
  

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When to Replace vs Rebuild

• Cost analysis and downtime consideration
  

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Troubleshooting Guide For Twin Disc MG516 Marine Gear

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Common Symptoms and Causes

• No drive, slipping, or delayed engagement
  

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Diagnostic Tips

• Interpreting pressure readings and performance issues
  

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When to Call a Specialist

• Scenarios that require professional intervention
  

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Storage, Preservation & Long-Term Maintenance For Twin Disc MG516 Marine Gear

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Preparing for Long-Term Lay-Up

• Fluid recommendations and corrosion prevention
  

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Periodic Maintenance in Storage

• Rotating the shaft, checking fluid, and inspections
  

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50 Frequently Asked Questions About The Twin Disc MG516 Marine Gear

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Rebuilt Twin Disc MG516 Marine Transmissions
Plate Kit For Twin Disc MG516 Marine Transmission
Gasket Kits For Twin Disc MG516 Marine Transmission

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Videos About Twin Disc Transmissions

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6 Reasons Your Twin Disc Transmission Has Low Oil Pressure

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7 Reasons Your Twin Disc Transmission Is Overheating

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3 Reasons Your Clutch Plates in Your Twin Disc Transmission Are Making Excessive Noise

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Bull Gear On A Twin Disc Transmission 

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Rebuilt Twin Disc Transmissions

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